Which of the following is correct:(a) Cells of all living organisms have a nucleus.(b) Both animal and plant cells have a well defined cell wall.(c) In prokaryotes, there are no membrane bound organelles.(d) Cells are formed de novo from abiotic materials.
Microscopic examination
The analysis of minute organisms, cellular organization of any biological structure, and composition of body fluids with the help of a microscope is known as microscopic examination. The magnification of specimens or samples under study helps in attaining a clearer picture of it.
Gram Staining
Named after Hans Christian Gram, a Danish bacteriologist, Gram stain is one of the most powerful staining techniques within microbiology. This technique was introduced in 1882 to identify pneumonia-causing organisms. The Gram staining technique uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.
Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.
The organism is defined as any individual entity that embodies the properties of life. It is classified into two types namely unicellular organism such as protists, bacteria and archaea and multicellular organism such as animals, plants and fungi.
Correct answer: The correct statement is ‘In prokaryotes, there is no membrane bound organelle’.
Reason for correct answer:
Option.c is given as ‘In prokaryotes, there are no membrane bound organelle’.
The cells are the basic structural and fundamental unit of the living system. The prokaryotes are the organism that does not contain true nucleus and membrane bound organelles. Since it is not covered with the membrane, the nucleus is called as nucleoid. The organelles such as nucleoid, ribosomes, mesosomes, glycocalyx are membrane free and are embedded in the cytoplasm. Hence option.c is correct.
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